Modified phenol formaldehyde resin and preparation method thereof

A phenolic resin, modified technology, applied in the direction of manufacturing tools, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of difficult to guarantee the quality of bamboo materials, short product life cycle, high water expansion rate, etc. To achieve the effect of light and stable color, good wettability, and improved boiling resistance

Active Publication Date: 2012-09-26
DYNEA GUANGDONG
View PDF4 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the processing and manufacturing of recombined bamboo materials use phenolic resin adhesives, but almost all of them follow the formula and production process of wood-based panels, which makes it difficult to guarantee the quality of bamboo materials in a long-term scale. The main problems are:...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A modified phenolic resin is synthesized by the following raw materials in the following mass percentages:

[0052] Phenol 20%

[0053] Formaldehyde solution 40%

[0054] Urea 7%

[0055] Melamine 5%

[0056] Alkaline aqueous solution 7%

[0057] Water 21%.

[0058] The preparation method of above-mentioned modified phenolic resin comprises the following steps:

[0059](1) Add formaldehyde aqueous solution in part within the range of addition ratio, add water in part, and adjust the pH value to between 7.5 and 10.5 with alkaline aqueous solution;

[0060] (2) Add urea within the range of the addition ratio and uniformly heat up to 70°C, and keep warm for 10 to 30 minutes;

[0061] (3) Add phenol, add alkaline aqueous solution within the range of addition ratio, and raise the temperature to 75°C;

[0062] (4) Insulate the reaction and check the viscosity. When the viscosity reaches 35-45mP.s, add melamine, add the remaining water, formaldehyde aqueous solution and...

Embodiment 2

[0065] Modified phenolic resin, synthesized by the following mass percentages from the following raw materials:

[0066] Phenol 19%

[0067] Formaldehyde solution 37%

[0068] Urea 11%

[0069] Melamine 4%

[0070] Alkaline aqueous solution 4%

[0071] Water 25%.

[0072] The preparation method of above-mentioned modified phenolic resin comprises the following steps:

[0073] (1) Add formaldehyde aqueous solution in part within the range of addition ratio, add water in part, and adjust the pH value to between 7.5 and 10.5 with alkaline aqueous solution;

[0074] (2) Add urea within the range of the addition ratio and uniformly heat up to 60°C, and keep warm for 10 to 30 minutes;

[0075] (3) Add phenol, add alkaline aqueous solution within the range of the addition ratio, and raise the temperature to 90°C;

[0076] (4) Insulate the reaction and check the viscosity. When the viscosity reaches 35-45mP.s, add melamine, add the remaining water, formaldehyde aqueous solution...

Embodiment 3

[0079] Modified phenolic resin, synthesized by the following mass percentages from the following raw materials:

[0080] Phenol 18%

[0081] Formaldehyde solution 40%

[0082] Urea 8%

[0083] Melamine 6%

[0084] Alkaline aqueous solution 5%

[0085] Water 23%.

[0086] The preparation method of above-mentioned modified phenolic resin comprises the following steps:

[0087] (1) Add formaldehyde aqueous solution in part within the range of addition ratio, add water in part, and adjust the pH value to between 7.5 and 10.5 with alkaline aqueous solution;

[0088] (2) Add urea within the range of the addition ratio and uniformly heat up to 60°C, and keep warm for 10 to 30 minutes;

[0089] (3) Add phenol, add alkaline aqueous solution in portions within the range of the addition ratio, and raise the temperature to 85°C;

[0090] (4) Insulate the reaction and check the viscosity. When the viscosity reaches 35-45mP.s, add melamine, add the remaining water, formaldehyde aqueo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a modified phenol formaldehyde resin which is synthesized from the following raw materials: 4-25% of phenol, 30-60% of formaldehyde water solution, 2-15% of urea, 2-15% of melamine, 3-8% of alkaline water solution and 10-30% of water. The preparation method comprises the following steps: after adding the formaldehyde water solution, adding the urea, phenol and melamine by stages in an alkaline environment, and controlling the viscosity or water solubility of the intermediate product and the final product in the preparation process, thereby obtaining the modified phenol formaldehyde resin. The raw materials of the modified phenol formaldehyde resin are added by stages to perform sufficient reaction, thereby improving the comprehensive properties of the phenol formaldehyde resin, including lower contents of free aldehyde and free phenol, lighter resin color, higher water boiling property and better wettability. The invention is more suitable for manufacturing of recombined bamboo, and is also applicable to the fields of dipping treatment of paper wood, bamboo, wood and fabric bases as well as manufacturing of grinding tools.

Description

technical field [0001] The invention relates to a modified phenolic resin and a preparation method thereof. Background technique [0002] Phenolic resin (PF for short) is widely used in the manufacture of adhesives and various composite materials due to its good chemical corrosion resistance, mechanical properties, and heat resistance. At present, most of the processing and manufacturing of recombined bamboo materials use phenolic resin adhesives, but almost all of them follow the formula and production process of wood-based panels, which makes it difficult to guarantee the quality of bamboo materials in a long-term scale. The main problems are: low bonding strength, impregnation Poor penetration, short product life cycle, unstable color, high cost, high water expansion rate, etc. [0003] In order to solve the above problems, many scholars continue to explore new methods for modifying phenolic resins. For example, Chinese patent CN201010200167.4 discloses a modified phenol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08G14/10C08G14/08C09J161/34B27K3/38
Inventor 边国民汪启鸿林健明陈澄刘玉波
Owner DYNEA GUANGDONG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap